Geenyous

This plugin sets WordPress to automatically download and install theme updates.
No configuration needed, simply install the plugin and activate it.

Auto Update Themes

This plugin does exactly what it is designed to do. I wanted something with no configuration necessary, so this is the perfect plugin.



Simply works

This plugin sets Wordpress to automatically download and install theme updates. No configuration needed, simply install the plugin and activate it.

Jon Tejnung

This plugin will give you three alternatives for managing your WordPress updates:
<ul>
<li>Update automatically – This updates WordPress/themes/plugins automatically and sends an email to the site admin when an update has been performed.</li>
<li>Update automatically (no email) – Same as the first alternative, but without the email.</li>
<li>Inform about updates once a week – This will send an email to the admin once a week if there are anything that can be updated.</li>
</ul>
Notice that only plugins/themes that resides in the WordPress 
repository will be updated/informed about.
The plugin has not been tested and is not primarily made for multi site-installations.

Simple Automatic Updates

Activate automatic updates or weekly notifications for the site.

Auto Update Themes vs Simple Automatic Updates